1 /* 2 * AimsLab RadioTrack (aka RadioVeveal) driver 3 * 4 * Copyright 1997 M. Kirkwood 5 * 6 * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com> 7 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org> 8 * Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk> 9 * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org> 10 * 11 * Notes on the hardware (reverse engineered from other peoples' 12 * reverse engineering of AIMS' code :-) 13 * 14 * Frequency control is done digitally -- ie out(port,encodefreq(95.8)); 15 * 16 * The signal strength query is unsurprisingly inaccurate. And it seems 17 * to indicate that (on my card, at least) the frequency setting isn't 18 * too great. (I have to tune up .025MHz from what the freq should be 19 * to get a report that the thing is tuned.) 20 * 21 * Volume control is (ugh) analogue: 22 * out(port, start_increasing_volume); 23 * wait(a_wee_while); 24 * out(port, stop_changing_the_volume); 25 * 26 * Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool. 27 */ 28 29 #include <linux/module.h> /* Modules */ 30 #include <linux/init.h> /* Initdata */ 31 #include <linux/ioport.h> /* request_region */ 32 #include <linux/delay.h> /* msleep */ 33 #include <linux/videodev2.h> /* kernel radio structs */ 34 #include <linux/io.h> /* outb, outb_p */ 35 #include <linux/slab.h> 36 #include <media/v4l2-device.h> 37 #include <media/v4l2-ioctl.h> 38 #include <media/v4l2-ctrls.h> 39 #include "radio-isa.h" 40 41 MODULE_AUTHOR("M. Kirkwood"); 42 MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card."); 43 MODULE_LICENSE("GPL"); 44 MODULE_VERSION("1.0.0"); 45 46 #ifndef CONFIG_RADIO_RTRACK_PORT 47 #define CONFIG_RADIO_RTRACK_PORT -1 48 #endif 49 50 #define RTRACK_MAX 2 51 52 static int io[RTRACK_MAX] = { [0] = CONFIG_RADIO_RTRACK_PORT, 53 [1 ... (RTRACK_MAX - 1)] = -1 }; 54 static int radio_nr[RTRACK_MAX] = { [0 ... (RTRACK_MAX - 1)] = -1 }; 55 56 module_param_array(io, int, NULL, 0444); 57 MODULE_PARM_DESC(io, "I/O addresses of the RadioTrack card (0x20f or 0x30f)"); 58 module_param_array(radio_nr, int, NULL, 0444); 59 MODULE_PARM_DESC(radio_nr, "Radio device numbers"); 60 61 struct rtrack { 62 struct radio_isa_card isa; 63 int curvol; 64 }; 65 66 static struct radio_isa_card *rtrack_alloc(void) 67 { 68 struct rtrack *rt = kzalloc(sizeof(struct rtrack), GFP_KERNEL); 69 70 if (rt) 71 rt->curvol = 0xff; 72 return rt ? &rt->isa : NULL; 73 } 74 75 /* The 128+64 on these outb's is to keep the volume stable while tuning. 76 * Without them, the volume _will_ creep up with each frequency change 77 * and bit 4 (+16) is to keep the signal strength meter enabled. 78 */ 79 80 static void send_0_byte(struct radio_isa_card *isa, int on) 81 { 82 outb_p(128+64+16+on+1, isa->io); /* wr-enable + data low */ 83 outb_p(128+64+16+on+2+1, isa->io); /* clock */ 84 msleep(1); 85 } 86 87 static void send_1_byte(struct radio_isa_card *isa, int on) 88 { 89 outb_p(128+64+16+on+4+1, isa->io); /* wr-enable+data high */ 90 outb_p(128+64+16+on+4+2+1, isa->io); /* clock */ 91 msleep(1); 92 } 93 94 static int rtrack_s_frequency(struct radio_isa_card *isa, u32 freq) 95 { 96 int on = v4l2_ctrl_g_ctrl(isa->mute) ? 0 : 8; 97 int i; 98 99 freq += 171200; /* Add 10.7 MHz IF */ 100 freq /= 800; /* Convert to 50 kHz units */ 101 102 send_0_byte(isa, on); /* 0: LSB of frequency */ 103 104 for (i = 0; i < 13; i++) /* : frequency bits (1-13) */ 105 if (freq & (1 << i)) 106 send_1_byte(isa, on); 107 else 108 send_0_byte(isa, on); 109 110 send_0_byte(isa, on); /* 14: test bit - always 0 */ 111 send_0_byte(isa, on); /* 15: test bit - always 0 */ 112 113 send_0_byte(isa, on); /* 16: band data 0 - always 0 */ 114 send_0_byte(isa, on); /* 17: band data 1 - always 0 */ 115 send_0_byte(isa, on); /* 18: band data 2 - always 0 */ 116 send_0_byte(isa, on); /* 19: time base - always 0 */ 117 118 send_0_byte(isa, on); /* 20: spacing (0 = 25 kHz) */ 119 send_1_byte(isa, on); /* 21: spacing (1 = 25 kHz) */ 120 send_0_byte(isa, on); /* 22: spacing (0 = 25 kHz) */ 121 send_1_byte(isa, on); /* 23: AM/FM (FM = 1, always) */ 122 123 outb(0xd0 + on, isa->io); /* volume steady + sigstr */ 124 return 0; 125 } 126 127 static u32 rtrack_g_signal(struct radio_isa_card *isa) 128 { 129 /* bit set = no signal present */ 130 return 0xffff * !(inb(isa->io) & 2); 131 } 132 133 static int rtrack_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol) 134 { 135 struct rtrack *rt = container_of(isa, struct rtrack, isa); 136 int curvol = rt->curvol; 137 138 if (mute) { 139 outb(0xd0, isa->io); /* volume steady + sigstr + off */ 140 return 0; 141 } 142 if (vol == 0) { /* volume = 0 means mute the card */ 143 outb(0x48, isa->io); /* volume down but still "on" */ 144 msleep(curvol * 3); /* make sure it's totally down */ 145 } else if (curvol < vol) { 146 outb(0x98, isa->io); /* volume up + sigstr + on */ 147 for (; curvol < vol; curvol++) 148 udelay(3000); 149 } else if (curvol > vol) { 150 outb(0x58, isa->io); /* volume down + sigstr + on */ 151 for (; curvol > vol; curvol--) 152 udelay(3000); 153 } 154 outb(0xd8, isa->io); /* volume steady + sigstr + on */ 155 rt->curvol = vol; 156 return 0; 157 } 158 159 /* Mute card - prevents noisy bootups */ 160 static int rtrack_initialize(struct radio_isa_card *isa) 161 { 162 /* this ensures that the volume is all the way up */ 163 outb(0x90, isa->io); /* volume up but still "on" */ 164 msleep(3000); /* make sure it's totally up */ 165 outb(0xc0, isa->io); /* steady volume, mute card */ 166 return 0; 167 } 168 169 static const struct radio_isa_ops rtrack_ops = { 170 .alloc = rtrack_alloc, 171 .init = rtrack_initialize, 172 .s_mute_volume = rtrack_s_mute_volume, 173 .s_frequency = rtrack_s_frequency, 174 .g_signal = rtrack_g_signal, 175 }; 176 177 static const int rtrack_ioports[] = { 0x20f, 0x30f }; 178 179 static struct radio_isa_driver rtrack_driver = { 180 .driver = { 181 .match = radio_isa_match, 182 .probe = radio_isa_probe, 183 .remove = radio_isa_remove, 184 .driver = { 185 .name = "radio-aimslab", 186 }, 187 }, 188 .io_params = io, 189 .radio_nr_params = radio_nr, 190 .io_ports = rtrack_ioports, 191 .num_of_io_ports = ARRAY_SIZE(rtrack_ioports), 192 .region_size = 2, 193 .card = "AIMSlab RadioTrack/RadioReveal", 194 .ops = &rtrack_ops, 195 .has_stereo = true, 196 .max_volume = 0xff, 197 }; 198 199 static int __init rtrack_init(void) 200 { 201 return isa_register_driver(&rtrack_driver.driver, RTRACK_MAX); 202 } 203 204 static void __exit rtrack_exit(void) 205 { 206 isa_unregister_driver(&rtrack_driver.driver); 207 } 208 209 module_init(rtrack_init); 210 module_exit(rtrack_exit); 211